ERROR opening https://cactus.nci.nih.gov/chemical/structure/CN1C%3DNC2%3DC%28C1%3DN%29N%3DCN2C3C%28C%28C%28O3%29CO%29O%29O/file?format=sdf&get3d=True  -- CN1C%3DNC2%3DC%28C1%3DN%29N%3DCN2C3C%28C%28C%28O3%29CO%29O%29O could not be loaded.